With laptops, there are 3 things to be worried about: video, wireless and suspend/resume.
Video: Always Intel integrated. Wifi : Anything from Intel Suspend/Resume: Thinkpads
Video: Always Intel integrated. Wifi : Anything from Intel Suspend/Resume: Thinkpads
With laptops, make sure you buy one with a factory install of Ubuntu or at least another Linux. There's enough out there (at least in the US and UK) to vote with your wallet and make compatibility someone else's problem.